CEL - System too Lean

**tontod** · 09-24-2008 07:42 AM

I had a leaky valve cover gasket, and not long after replacing it I got this:

17544 - Fuel Trim Bank 1 (Add): System too Lean
P1136-35-10 --- Intermittent

I get some hesitation under hard acceleration, especially going uphill

I have the PES T28 kit, 2.25" borla exhaust, carbonio CAI

What should I do? Thanks.

**A4ringedONE8T** · 09-24-2008 07:44 AM

Boost/vac leak would be the first thing I would check

**tontod** · 09-24-2008 10:47 AM

Ok, thanks.

**GetBoosted84** · 09-24-2008 12:02 PM

Originally Posted by tontod

Ok, thanks.

Can you please let us know if you do find a boost leak? I'm going through an issue at the moment with my PES tune also.

Thanks!

**tontod** · 09-24-2008 12:40 PM

I will. Though, I'm not sure when I'll get a chance, I'm going on travel end of this week.

**quattro16** · 09-24-2008 01:08 PM

Maf, Whens The Last Time You Changed It.

**tontod** · 09-24-2008 01:28 PM

The MAF has never been replaced as far as I am aware.

**SFexBOY** · 09-24-2008 01:45 PM

most likely MAF. Got that a while back, swapped a new one in...presto...fixed.

**tontod** · 09-24-2008 02:25 PM

I'll get it taken a look at this Friday.

**UN-PIMP-Z-A4** · 09-24-2008 09:02 PM

I have a pes tune as well and when i got that code it was a vacuum leak...

**tontod** · 09-25-2008 09:01 PM

My MAF @ idle = ~3.5 g/s. Is that a normal reading?

**tontod** · 10-13-2008 07:03 PM

The problem turned out to be bad wiring to the MAF. Also, the ICM wasnt bolted down properly due to it having to be relocated because of the carbonio CAI.